One time he was crossing the ocean. Vibhishana wrote the name of Rama on a leaf and wrapped it in his cloth. "Walk on the sea diligently.
That guy was easily going over the ocean. It was curious to know what Vibhishana wrote on the tip of the pancha.
When it was unpacked, he saw a simple Ramanamana written on a simple leaf. "Just like that, just a surname!" That is.
As soon as he had doubts in his mind, he was at sea.